Secondary battery

Abstract

A secondary battery comprising: a substrate; a first current collector; a first electrode; a solid electrolyte; a second electrode; and a second current collector; the first current collector being formed on the substrate and serving as a current collector of the first electrode, the first electrode being formed on the first current collector, the solid electrolyte being formed on the first electrode, the second electrode being formed on the solid electrolyte, the second current collector being formed on the second electrode and serving as a current collector of the second electrode, at least one electrode selected from the group consisting of the first electrode and the second electrode containing at least one material selected from the group consisting of an ion conductive material and an electron conductive material.

1. A secondary battery comprising: a substrate; a first current collector; a first electrode; a solid electrolyte; a second electrode; and a second current collector;
 said first current collector being formed on said substrate and serving as a current collector of said first electrode, 
 said first electrode being formed on said first current collector, 
 said solid electrolyte being formed on said first electrode, 
 said second electrode being formed on said solid electrolyte, 
 said second culTent collector being formed on said second electrode and serving as a current collector of said second electrode, 
 at least one of said first and second electrodes containing an electrode material and at least one conductive material which is different from said electrode material, said different conductive material comprising at least one of an ion conductive material and an electron conductive material, 
 wherein said at least one electrode contains at least said ion conductive material, said ion conductive material extending in a thickness direction of said electrode to form at least one ion conducting path connected with said solid electrolyte, and 
 wherein the amount of said ion conductive material forming said ion conducting path decreases from the current collector side to the solid electrolyte side. 
 
     
     
       2. The secondary battery in accordance with  claim 1 ,
 wherein the volume percentage of said different conductive material in said at least one electrode is not less than 5 vol % and not more than 50 vol %. 
 
     
     
       3. The secondary battery in accordance with  claim 1 ,
 wherein said at least one electrode has at least one groove formed along at least one of contact surfaces between said electrode and the current collector thereof and contact surfaces between said electrode and said solid electrolyte, said at least one different conductive material being filled inside said groove. 
 
     
     
       4. The secondary battery in accordance with  claim 1 ,
 wherein said secondary battery is an all solid-state thin film lithium secondary battery. 
 
     
     
       5. The secondary battery in accordance with  claim 1 , wherein said electron conductive material is the same as a material of said first or second current collector. 
     
     
       6. The secondary battery in accordance with  claim 1 , wherein said ion conductive material is the same as a material of said solid electrolyte. 
     
     
       7. The secondary battery in accordance with  claim 1 , wherein said electron conductive material is selected from the group consisting of platinum, platinum/palladium, gold, silver, aluminum, copper, indium-tin-oxide film, and carbon materials. 
     
     
       8. The secondary battery in accordance with  claim 1 , wherein the ion conductive material is selected from the group consisting of lithium phosphate, Li PO 4-x N x , lithium ion conductive sulfides, doped lithium ion conductive solid electrolytes, and oxyacid salts of lithium. 
     
     
       9. A secondary battery comprising: a substrate; a first current collector; a first electrode; a solid electrolyte; a second electrode; and a second current collector;
 said first current collector being formed on said substrate and serving as a current collector of said first electrode, 
 said first electrode being formed on said first current collector, 
 said solid electrolyte being formed on said first electrode, 
 said second electrode being formed on said solid electrolyte, 
 said second current collector being formed on said second electrode and serving as a current collector of said second electrode, 
 at least one of said first and second electrodes containing an electrode material and at least one conductive material which is different from said electrode material, said different conductive material comprising at least one of an ion conductive material and an electron conductive material, 
 wherein said at least one electrode contains at least said electron conductive material, said electron conductive material extending in a thickness direction of said electrode to form at least one electron conducting path connected with the current collector thereof, and 
 wherein the amount of said electron conductive material forming said electron conducting path decreases from the current collector side to the solid electrolyte side. 
 
     
     
       10. The secondary battery in accordance with  claim 9 ,
 wherein the volume percentage of said different conductive material in said at least one electrode is not less than 5 vol % and not more than 50 vol %. 
 
     
     
       11. The secondary battery in accordance with  claim 9 ,
 wherein said at least one electrode has at least one groove formed along at least one of contact surfaces between said electrode and the current collector thereof and contact surfaces between said electrode and said solid electrolyte, said at least one different conductive material being filled inside said groove. 
 
     
     
       12. The secondary battery in accordance with  claim 9 ,
 wherein said secondary battery is an all solid-state thin film lithium secondary battery. 
 
     
     
       13. The secondary battery in accordance with  claim 9 , wherein said electron conductive material is the same as a material of said first or second current collector. 
     
     
       14. The secondary battery in accordance with  claim 9 , wherein said ion conductive material is the same as a material of said solid electrolyte. 
     
     
       15. The secondary battery in accordance with  claim 9 , wherein said electron conductive material is selected from the group consisting of platinum, platinum/palladium, gold, silver, aluminum, copper, indium-tin-oxide film, and carbon materials. 
     
     
       16. The secondary battery in accordance with  claim 9 , wherein the ion conductive material is selected from the group consisting of lithium phosphate, Li PO 4-x N x , lithium ion conductive sulfides, doped lithium ion conductive solid electrolytes, and oxyacid salts of lithium.